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These routing steps are documented product surfaces in several widely used AI platforms and serving stacks.\n  Routing helps AI services stay affordable, fast, and available at scale, and it shapes trust. Trust can break when routing changes the cost, quality, or accountability of a response without the user being able to tell what happened. \"Which model answered?\" is only part of the audit question. The runtime path matters.\n  Adaptive AI systems should produce a runtime transparency artifact called the route receipt. A route receipt is a compact record of the route that served a request. 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